Multiplier for hydraulic presses.



No. 777,008, PATENTED DEC. 6, 1904.

A. DERIES & C. UMBAGH.

MULTIPLIER FOR HYDRAULIC PRESSES.

APPLICATION FILED 1120.21, 1903.

N0 MODEL.

@vih/mnu UNITED STATES Patented l'jeoember 6, 1904.

PATENT OFFICE] ARMAND DERES, OF LYONS, AND CHARLES UMBACFI, OF LHORME PAR ST. JULIEN, FRANCE, ASSIGNORS TO LA SOCIETE NOUVELLE DES ETABLISSEMENTS DE LHORME ET DE LA BUIRE, OF LYONS,

FRANCE.

IVIULTIPLIEH FOR HYDRAULIC PRESSES.

SPECIFICATION forming part of Letters Patent No. 777,008, dated December 6, 1904.

Application led December 21, 1903. Serial No.186y060. No model.)

To all whom it may con/cern:

Be it known that we, ARMAND Daams, residing at Rue Victor Hugo, Lyons, and CHARLES UMBAoI-r, residing at lHorme par St. Julien, France, citizens of the Republic of France, have invented a new and use't'ul Improvement in or Relating to Multipliers for Hydraulic Presses, which improvement is fully set forth in the following specilication.

This invention relates to improvements in hydraulic presses which are provided with a direct-'acting steam-pressure multiplier. It is customary to place the multiplier with its axis vertical, in which case the liuid-pressure on the piston of the multiplier is supplemented by the weight of the piston and plunger ii the piston moves downward under such pres* sure and lessened to a similar degree if it moves upward under such pressure. At the same time the lifting-pistons attached to the cross-head of the press have to lift also the weight of the multiplier-piston in the former arrangement, but are relieved of that weight in the latter case. Our improvements contemplate arranging the multiplier-cylinder with its axis horizontal, so that these effects are obviated. Ve also provide the multiplier with two pistons and support their rods in a novel manner, as hereinafter set forth, and particularly lpointed out in the claims.

In the accompanying drawings, Figure 1 is an elevation of a hydraulic press equipped with our improved multiplier. F ig. 2 is a longitudinal section of the pistons and rods.

The hydraulic press comprises an anvil 1, adjacent to which are columns 2, supporting a fixed yoke 3, on which is mounted the large high-pressure cylinder 4. The main plunger 5 in said cylinder is connected to the crosshead 6, which carries the press-head and slides on the columns. It is also connected by two rods 7 to the pistons 8 of the raising-cylinders 9, which may be operated by hydraulic, pneumatic, or steam pressure.

The steam-multiplier comprises a cylinder 10, which is open at each end and contains two pistons 11 12. The former has a tubular rod 13, which passes freely through one end of the cylinder 10 and has a closed end to act as a plunger in a cylinder 14, supported with its axis in line with that of the cylinder 10. The piston 12 has a rod 15 of smaller cross-section than the rod 13. It projects on both sides of the piston 12. One portion of it passes through the adjacent open end oi' the cylinder 10 and forms a plunger acting in a cylinder' 16 in line with the cylinder 10. The other portion ot' the rod 15 slides in the tubular rod 13, which thus forms a guide for it. A slight shoulder on one or both ot' the pistons causes a narrow space to be lett between them when they meet, as shown in Fig. 2. The cylinder 10 has two admission-ports 17 opening` into it near each end at the point where this space comes when the two pistons are at the extremes ot' their stroke. It Jfollows that only one piston will move when steam is admitted, the other serving as an abutment or head for the cylinder 10. As thc two plungers 13 15 are of different diameters, the pressure delivered by them will dilier considerably, so that the press can utilize the higher pressure for forging operations and the lower pressure for shaping armor-plates and the like. .Both cylinders 14C 16 are connected by pipes 18 19 toa common delivery-pipe 20., which leads to the cylinder A ot' the press. A two-way cock 21 enables either one of the pressure-cylinders to be used at will.

Having thus described our invention, what we claim is 1. A steam-pressure multiplier for hydraulic presses, comprising a cylinder open at each end and containing two pistons, one of which has a tubular rod on one side only passing through one end of the cylinder and forming a plunger, the other having a rod oi. smaller' diameter projecting-on both sides of the piston, on one side passing through the other end oi' the cylinder and forming a plunger and on the other side entering' and sliding in the tubular rod of the other piston, and cylinders in which these plungers not.

Q. A steam pressure multiplier for hydraulie presses, Comprising a Cylinder open at each end and containing two pistons, one of which has a tubular rod on one side only passing through one end of the cylinder and forming st plunger, the other having a rod of smailer diameter projecting' on both sides of the piston, on one side passing through the y other end of the cylinder and forming zt plunger and on the other side entering and sliding in the tubular rod of the other piston,'cy1in ders in which these plungers act, and a oommou delivery-pipe connected with said cylinders by a three-Way valve.

In testimony whereof We have signed this speoiioation in the presence of two subscribing Witnesses.

ARMAND DERIES. CHARLES UMBACH.

Vv'tnesses:

THos. N. BROWN, MARIN VAoHoN. 

